const menuData = [
    {
        label: '一级菜单1',
        children: [
            { label: '二级菜单1-1' },
            { label: '二级菜单1-2', children: [
                    { label: '三级菜单1-2-1' }
                ]}
        ]
    },
    {
        label: '一级菜单2',
        children: [
            { label: '二级菜单2-1' },
            { label: '二级菜单2-2' }
        ]
    }
];